Fixes #372

Fix rooms grouping examples in docs

Fixing when the path has space, it closes #368

Fix this by pointing to the tag via a git URL

Also update changelog and fix some linting errors.

Fixes #360

Adding 'rooms' API

fixes #364

updates #359

Fix a timeout bug in chat state notifications

* Update the docs to mention the new ``authentication`` option.
* Update failing tests due to ``prebind`` being replaced with ``authentication``.
* Rename 'manual' value for authentication to 'login' since it's used in both manual and auto cases.

Conflicts:
	converse.js

This caused a bug whereby a chat box would open only on chat state
notifications.

Also refactored the chats.open and chats.get methods so that they now reuse the
same map function and so that chats.get can now return any chat box and not
just already open ones.

Updated the tests to properly test this and updated the docs.

Fix the known bug where a state notification reopens a chat box

Fix the ChatRoomOccupants storage id

Fix the plugin extend function

Add tests for contacts.add API method and make it a bit more compact.
Add entry in changelog.

update #354

contacts.add API to register contacts